<template>
  <div>
      <!-- 面包屑导航区域 -->
        <el-breadcrumb>
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>权限管理</el-breadcrumb-item>
            <el-breadcrumb-item>角色列表</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 添加角色按钮 -->
            <el-row>
                <el-col>
                    <el-button type="primary">添加角色</el-button>
                </el-col>
            </el-row>
            <!-- 角色列表区域 -->
            <el-table :data="rolesList" border stripe>
                <!-- 展开列 -->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-row :class="['bb', index1 === 0 ? 'tb' : '', 'vcenter' ]" v-for="(item1, index1) in scope.row.children" :key="item1.id">
                            <!-- 渲染一级权限 -->
                            <el-col :span="5">
                                <el-tag  closable @close="removeRightById(scope.row, item1.id)">{{ item1.authName }}</el-tag><i class="el-icon-caret-right"></i>
                            </el-col>
                            <!-- 渲染二级和三级权限 -->
                            <el-col :span="19">
                                <el-row :class="[index === 0 ? '' : 'tb', 'vcenter']" v-for="(item2, index) in item1.children" :key="item2.id">
                                    <el-col :span="6">
                                        <el-tag type="success"  closable @close="removeRightById(scope.row, item2.id)">{{ item2.authName }}</el-tag><i class="el-icon-caret-right"></i>
                                    </el-col>
                                    <el-col :span="18">
                                        <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{ item3.authName }}</el-tag>
                                    </el-col>
                                </el-row>
                            </el-col>
                        </el-row>
                        <!-- <pre>
                            {{ scope.row }}
                        </pre> -->
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index" label="#"></el-table-column>
                <el-table-column prop="roleName" label="角色名称"></el-table-column>
                <el-table-column prop="roleDesc" label="角色描述"></el-table-column>
                <el-table-column label="操作" width="300px">
                    <template slot-scope="scope">
                        <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
                        <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
                        <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-card>
        <!-- 分配权限对话框 -->
        <el-dialog
            title="分配权限"
            :visible.sync="setRightDialogVisible"
            width="50%"
            @close="setRightDialogClosed">
            <!-- 树形控件 -->
            <el-tree :data="rightsList" :props="treeProps" 
                show-checkbox node-key="id" 
                default-expand-all 
                :default-checked-keys="defKeys"
                ref="treeRef"></el-tree>
            <span slot="footer" class="dialog-footer">
                <el-button @click="setRightDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="allotRights">确 定</el-button>
            </span>
        </el-dialog>
  </div>
</template>

<script>
export default {
    data() {
        return {
            // 所有角色列表数据
            rolesList: [],
            // 控制分配权限对话框的显示与隐藏
            setRightDialogVisible: false,
            // 所有权限的数据
            rightsList: [],
            treeProps: {
                children: 'children',
                label: 'authName'
            },
            defKeys: [],
            // 当前即将分配权限的角色的 id
            roleId: ''
        }
    },
    created() {
        this.getRolesList()
    },
    methods: {
        // 发起获取角色列表请求
        async getRolesList() {
            const { data: res } = await this.$http.get('roles')
            // console.log(res);
            if(res.meta.status !== 200) {
                return this.$message.error('获取权限列表失败！')
            }
            this.rolesList = res.data
            console.log(this.rolesList);
        },
        // 根据id删除对应的权限
        async removeRightById(role, rightId) {
            const confirmResult = await this.$confirm('此操作将永久删除该权限, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(error => error)
            if(confirmResult !== 'confirm') {
                return this.$message.info('已取消了删除！')
            }
            const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除权限失败！')
            }
            // this.getRolesList()
            role.children = res.data
        },
        // 显示分配权限的对话框
        async showSetRightDialog(role) {
            this.roleId = role.id
            // 获取所有的权限数据
            const { data: res } = await this.$http.get('rights/tree')
            if(res.meta.status !== 200) {
                return this.$message.error('获取权限列表数据失败！')
            }
            // 把获取到的权限数据保存到 data 中
            this.rightsList = res.data
            this.getLeafKeys(role, this.defKeys)
            this.setRightDialogVisible = true
        },
        // 通过递归函数获取角色下三级权限的 id ，并保存到 defKeys 数组中
        getLeafKeys(node, arr) {
            // 如果当前 node 节点不包含 children 属性，则是三级节点
            if(!node.children) {
                return arr.push(node.id)
            }
            node.children.forEach(item => this.getLeafKeys(item, arr))
        },
        // 监听分配权限对话框的关闭事件
        setRightDialogClosed() {
            this.defKeys = []
        },
        // 分配权限
        async allotRights() {
            const keys = [...this.$refs.treeRef.getCheckedKeys(), ...this.$refs.treeRef.getHalfCheckedKeys()]
            const idStr = keys.join(',')
            const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
            if(res.meta.status !== 200) {
                return this.$message.error('分配权限失败！')
            }
            this.$message.success('分配权限成功！')
            this.getRolesList()           
            this.setRightDialogVisible = false
        }
    }
}
</script>

<style lang="less" scoped>
    .el-tag {
        margin: 7px;
    }

    .tb {
        border-top: 1px solid #eee;
    }

    .bb {
        border-bottom: 1px solid #eee;
    }

    .vcenter {
        display: flex;
        align-items: center;
    }
</style>